Three are the signs of a hypocrite, even if he observed fast and prayed and asserted that he was a Muslim.
Sahih Muslim Book 1, Hadith 119
← Previous Hadith There are three characteristics of a hypocrite: when he spoke he told a lie, when he made promise he acted treacherously, and when he was trusted he betrayed.

Sahih Muslim Book 1, Hadith 118 Next Hadith → even if he observed fast and prayed and asserted that he was a Muslim.

Sahih Muslim Book 1, Hadith 120